Dehumidifier: Runs all the time

If the dehumidifier runs continually and constantly collects water, it's likely that the dehumidifier's capacity is too low for the space; add another dehumidifier to the space to increase the water-collection capacity. A defective humidity sensor can also cause the dehumidifier to run constantly. If the evaporator is iced up and not defrosting, you may need to replace the evaporator thermistor—the dehumidifier won't collect water if the evaporator is iced up. If you see no frost on the evaporator while the dehumidifier is running, and the dehumidifier isn't collecting water, the dehumidifier may be low on refrigerant or the compressor may be defective. See the repairs below for ways to correct the problem.

These repairs may help solve your Dehumidifier problem:

Replace the dehumidifier evaporator thermistor


The evaporator thermistor is a temperature sensor on the evaporator coils. It communicates the temperature of the evaporator coil to the electronic control board; if the temperature is too low, the electronic control board detects excessive frost and begins the defrost cycle. If the thermistor isn’t working properly, the electronic control won’t defrost the coils. Replace the evaporator thermistor if it doesn't detect the evaporator temperature.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the dehumidifier humidistat


The humidistat is a sensor on the front of the evaporator coil that monitors the humidity of the room air being pulled in through the evaporator. The humidistat communicates the humidity to the electronic control board through a wire harness connection. If the thermistor is defective, the electronic control won’t properly detect humidity and dehumidify the room. Replace the humidistat if it doesn't sense the humidity.

For manuals, repair guides, and specific part recommendations, enter your model number.